Update duckdb index files

RealTimeData--arxiv_june_2023/train/index.duckdb

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:11f936572e33365bfe9fbaa04189d58b975ed9614e0b9a8ee33ba06615d71271
-size 375140352
+oid sha256:0c308966fa24bc87addf4ffc6e74a7a18d3ae5186fa4ae33d9cc8f8c667fd5b9
+size 374091776